I am using SP3 xp pro. And when I try to install the fix KB888111, like I read online, it says that I dont need this update, my service package is updated. But I still get the error when trying to install my asus audio drivers.
Help?

Yes it does. Because you are usign a Beta Product which is not supported and it doesnt work with your drivers. Therefor you will have to either 1.) check with your sound device manufacturer to see if they have Beta drivers that work with XP SP3 Beta or you will have to wait till they release SP3 and the sound device manufacturer updates their drivers to work with it.

Being that XP SP3 is still in its beta stages and not final it is your responsibilty. Microsoft says they offer no support for Beta products. So check the Asus website maybe they have some beta drivers for you.